What is reflection, a reflection factor

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Reflection is the optical property of a material that indicates how much light has been reflected from the material in proportion to the amount of material that has fallen on that material. The reflectivity then depends on the material, the chemical composition and its structure, the state of the material and its surface, the wavelength, and also the direction of the light incident and reflection, the polarization of light. The surface is divided into direct and diffuse diffusion of light. Several methods are used to measure reflectivity.